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The Lich

While the Snail was just a running gag at first, he eventually became an integral part of the story when he releases The Lich in the episode "Mortal Folly." The Snail comes out of Finn's bag to wave to the viewers, but then falls under The Lich's mind-control spell and breaks the amber prison by bashing it with his head. He appears at the end of "Mortal Recoil," and once again at the beginning of "The Lich," still being controlled by the Lich. In the Adventure Time comic book series, he goes into the Lich's bag while still under his control and comes out normal again unharmed.

At the end of "In Your Footsteps," the Snail speaks for the first time and gains The Enchiridion. The Snail still continues to appear in each episode, and (when examined closely) appears to still have green eyes and an evil expression on its face.

In the episode "The Lich," the Lich ends up changing bodies moving to that of the deceased Billy. After this, the snail no longer shows any further sign of possession as revealed in "Up a Tree."

Season 1

According to Pen's Spring, they dropped the ball on this episode, and the original airing of the episode did not have the Snail. They claimed they would add it in for reruns.[citation needed] The Snail is now seen behind lumpy Jake on a streamer at prom-coming just after Finn falls through the building.

Twice during the House Hunting Song as Finn and Jake walk towards the camera (akin to the repeated appearance of background as characters walk by it as used as a method for animating less). This episode shows the Snail the most number of times.

This episode originally had no snail appearing in it. However, the Snail has been added in the Swamp of Embarrassment at the base of the tree next to the woman and her baby showering who calls Finn a pervert.

On the leaf falling down by the tree house, and also on the leaf when it lands in the forest. This is the second time the Snail was seen clearly on the show, but it was the first time he was used in the plot.

Season 4

In season 4, the possessed snail is still making cameos, but it played a major part in the episode "In Your Footsteps." As inferred from the dream in "The Lich," the Snail appears to have been abandoned by the Lich when he took over Billy.

At the bottom right corner of the Ice King's cave entrance as he leaves. Also, it appears very small under a desk in the Ice King's castle when he looks for the book where he gets his song inspiration from.

Also, in "Finn the Human," the snail is shown as a regular snail (without eyes, a mouth, and arms).

Similar recurring, hidden characters show up in other media, an example of which is the snail in Blue's Clues.

In "Simon & Marcy," he appears during a flashback from 996 years ago, proving that he has has a lifespan much larger than that of a normal snail. However, this could possibly just be another snail entirely.

In "Evicted!" during the "House Hunting Song," the snail appears twice in one sequence, when Finn and Jake are walking up a hill. This has not happened again after this episode.

In other TV shows, things like baby heads serve a similar theme of being a creepy easter egg lurking in the background of multiple episodes with sinister implications.

In "Princess Cookie," the snail is seen in Baby Snaps' flashback in the orphanage possessed by the Lich, even though he couldn't be possessed because the flashback took place a long time ago before "Mortal Folly."

In "Web Weirdos," the Snail can barely be seen because it is covered up by the Cartoon Network HD logo, but appears under the normal logo on SD channels.